Allulose composition with excellent stability

Abstract

This application relates to an allulose composition having excellent stability.

Description

Technical Field

[0001] This application relates to an allulose composition with excellent stability.

Background Art

[0002] Allulose is an epimer of D-fructose and is a type of functional saccharide known as a rare sugar. It exhibits a high sweetness of about 60 - 70% of that of sugar, has almost zero calories, and is known to be effective in preventing and improving diabetes. Also, allulose is known to have excellent solubility and is one of the materials attracting attention for utilization in foods.

[0003] When allulose syrup is stored for a long time, allulose may be converted into different substances or decomposed, resulting in a decrease in the allulose content. For example, allulose may be converted into different saccharides such as fructose or furfural-based substances such as HMF. As a result, the allulose syrup is decomposed or converted into different substances during storage, and the content gradually decreases.

Summary of the Invention

Problems to be Solved by the Invention

[0004] One example of this application relates to an allulose composition with excellent stability.

[0005] Another example of this application relates to a method of adjusting the dissolved oxygen content of an allulose composition to increase the stability of allulose.

Means for Solving the Problems

[0006] One example of this application relates to an allulose composition with excellent stability. Specifically, the allulose composition according to one example of this application can have a dissolved oxygen (DO) concentration of 8 ppm or less and excellent storage stability.

[0007] Another example of the present application relates to a method of adjusting the dissolved oxygen content of an allulose composition to increase the stability of allulose. Specifically, a method of increasing the stability of allulose according to an example of the present application may be to reduce the dissolved oxygen (DO) in the allulose composition and increase the storage stability. As used herein, the storage stability of allulose means that the characteristics of allulose or allulose syrup measured immediately after production or at the start of storage are maintained or the changes are minimized during the storage period, and the characteristics include, but are not limited to, allulose content, pH, and / or color value.

[0008] Hereinafter, the present application will be described in more detail. An example of the present application relates to an allulose composition containing dissolved oxygen at a specific concentration or less. The allulose composition may have a minimized reduction rate of the allulose content during storage.

[0009] For example, the dissolved oxygen concentration of the allulose composition according to an example of the present application may be 10 ppm or less, 9.5 ppm or less, 9 ppm or less, 8.5 ppm or less, 8 ppm or less, 7.5 ppm or less, 7 ppm or less, 6.9 ppm or less, 6.8 ppm or less, 6.7 ppm or less, 6.6 ppm or less, 6.5 ppm or less, 6.4 ppm or less, 6.3 ppm or less, 6.2 ppm or less, 6.1 ppm or less, 6 ppm or less, 5.9 ppm or less, 5.8 ppm or less, 5.7 ppm or less, 5.6 ppm or less, 5.5 ppm or less, 5.4 ppm or less, 5.3 ppm or less, 5.2 ppm or less, 5.1 ppm or less, 5 ppm or less, 4.9 ppm or less, 4.8 ppm or less, 4.7 ppm or less, 4.6 ppm or less, 4.5 ppm or less, 4.4 ppm or less, 4.3 ppm or less, 4.2 ppm or less, 4.1 ppm or less, 4 ppm or less, 3.9 ppm or less, 3.8 ppm or less, 3.7 ppm or less, 3.6 ppm or less, 3.5 ppm or less, 3.4 ppm or less, 3.3 ppm or less, 3.2 ppm or less, 3.1 ppm or less, 3 ppm or less, 2.9 ppm or less, 2.8 ppm or less, 2.7 ppm or less, 2.6 ppm or less, 2.5 ppm or less, 2.4 ppm or less, 2.3 ppm or less, 2.2 ppm or less, 2.1 ppm or less, 2 ppm or less, 1.9 ppm or less, 1.8 ppm or less, 1.7 ppm or less, 1.6 ppm or less, or 1.5 ppm or less.

[0010] For example, the oxygen saturation rate of the allulose composition according to an example of the present application may be 90% sat or less, 89% sat or less, 88% sat or less, 87% sat or less, 86% sat or less, 85% sat or less, 84% sat or less, 83% sat or less, 82% sat or less, 81% sat or less, 80% sat or less, 79% sat or less, 78% sat or less, 77% sat or less, 76% sat or less, 75% sat or less, 74% sat or less, 73% sat or less, 72% sat or less, 71% sat or less, 70% sat or less, 69% sat or less, 68% sat or less, 67% sat or less, 66% sat or less, 65% sat or less, 64% sat or less, 63% sat or less, 62% sat or less, 61% sat or less, 60% sat or less, 59% sat or less, 58% sat or less, 57% sat or less, 56% sat or less, 55% sat or less, 54% sat or less, 53% sat or less, 52% sat or less, 51% sat or less, 50% sat or less, 49% sat or less, 48% sat or less, 47% sat or less, 46% sat or less, 45% sat or less, 44% sat or less, 43% sat or less, 42% sat or less, 41% sat or less, 40% sat or less, 39% sat or less, 38% sat or less, 37% sat or less, 36% sat or less, 35% sat or less, 34% sat or less, 33% sat or less, 32% sat or less, 31% sat or less, 30% sat or less, 29% sat or less, 28% sat or less, 27% sat or less, 26% sat or less, 25% sat or less, 24% sat or less, 23% sat or less, 22% sat or less, 21% sat or less, or 20% sat or less. The oxygen saturation rate is the oxygen saturation of the allulose composition based on the oxygen saturation of 100% in the air. The oxygen saturation in the air may be, for example, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, or 25%.

[0011] The dissolved oxygen concentration or the oxygen saturation rate may be measured under normal temperature (20 to 30 °C, for example, a temperature of 24.5 °C) conditions.

[0012] An allulose composition according to an example of the present application can provide an allulose composition with improved storage stability and maintaining the maximum allulose content under storage conditions such as storage and distribution immediately after production. In this specification, the storage stability of the allulose composition may mean that the allulose content contained in the allulose composition is the same as that immediately after production, or the decrease in the allulose content is minimized.

[0013] For example, based on 100% by weight of the solid content of allulose immediately after the production of the allulose composition or at the start of storage, during the storage period, the reduction rate of the allulose solid content is close to 0%, for example, the reduction rate of the allulose content is 10% or less, 9% or less, 8% or less, 7% or less, 6.5% or less, 6.3% or less, 6% or less, 5% or less, 4.5% or less, 4% or less, 3.5% or less, 3% or less, 2.5% or less, 2% or less, 1.9% or less, 1.8% or less, 1.7% or less, 1.6% or less, 1.5% or less, 1.4% or less, 1.3% or less, 1.2% or less, 1.1% or less, 1% or less, 0.9% or less, 0.8% or less, 0.7% or less, 0.6% or less, 0.5% or less, 0.4% or less, 0.3% or less, 0.2% or less, or 0.1% or less. As an example, the reduction rate of the allulose content is the reduction rate of the allulose content measured after storage at a temperature of 45°C for 7 days or after storage at a temperature of 35°C for 4 weeks based on 100% of the content at the time of production or start of storage of the allulose syrup. Specifically, it can be the reduction rate of the allulose solid content (for example, by weight) contained in the allulose syrup.

[0014] As an example, an allulose composition according to an example of the present application has a dissolved oxygen concentration of 8 ppm or less, and after storage at a temperature of 45°C for 7 days, the reduction rate of the allulose content is 5% or less, a dissolved oxygen concentration of 6.7 ppm or less, and after storage at a temperature of 45°C for 7 days, the reduction rate of the allulose content is 1.4% or less, a dissolved oxygen concentration of 6 ppm or less, and after storage at a temperature of 45°C for 7 days, the reduction rate of the allulose content is 1.1% or less, or a dissolved oxygen concentration of 4.3 ppm or less, and after storage at a temperature of 45°C for 7 days, the reduction rate of the allulose content is 1% or less.

[0015] As an example, the allulose composition according to an example of the present application has a dissolved oxygen concentration of 8 ppm or less, and after storage at a temperature of 35°C for 4 weeks, the reduction rate of the allulose content is 10% or less, a dissolved oxygen concentration of 6.7 ppm or less, and after storage at a temperature of 35°C for 4 weeks, the reduction rate of the allulose content is 6.5% or less, a dissolved oxygen concentration of 5 ppm or less, and after storage at a temperature of 35°C for 4 weeks, the reduction rate of the allulose content is 6.3% or less, or a dissolved oxygen concentration of 3.9 ppm or less, and after storage at a temperature of 35°C for 4 weeks, the reduction rate of the allulose content may be 6% or less.

[0016] The allulose composition according to an example of the present application has improved storage stability, and under storage conditions such as storage and distribution immediately after production, the pH of allulose can be the same as that immediately after production or the pH reduction can be minimized.

[0017] Therefore, the allulose composition according to an example of the present application can be made to prevent pH reduction. For example, based on the pH immediately after the production of the allulose composition or at the start of storage, after storing the allulose composition at a temperature of 35°C for 4 weeks, the pH reduction value can be 1 or less, 0.9 or less, 0.85 or less, 0.8 or less, 0.75 or less, 0.7 or less, 0.65 or less, 0.6 or less, or 0.55 or less.

[0018] As an example, the allulose composition according to an example of the present application has a dissolved oxygen concentration of 8 ppm or less, and after storage at a temperature of 35°C for 4 weeks, the pH reduction amount is 1 or less, a dissolved oxygen concentration of 6.7 ppm or less, and after storage at a temperature of 35°C for 4 weeks, the pH reduction amount is 0.83 or less, a dissolved oxygen concentration of 5 ppm or less, and after storage at a temperature of 35°C for 4 weeks, the pH reduction amount is 0.7 or less, or a dissolved oxygen concentration of 3.9 ppm or less, and after storage at a temperature of 35°C for 4 weeks, the pH reduction amount may be 0.65 or less.

[0019] Since allulose is decomposed more rapidly at low pH, pH is a very important factor in the stability of allulose content. The allulose syrup according to an example of the present application has a very low pH decrease amount during the storage period, and the allulose content can be stored at the maximum level.

[0020] The allulose composition according to an example of the present application can have improved storage stability, and the color value of allulose is the same as that immediately after production under storage conditions such as storage and distribution from immediately after production, or the increase in color value (e.g., browning) is minimized.

[0021] Therefore, the allulose composition according to an example of the present application may be one in which browning is prevented. For example, based on the color value immediately after production of the allulose composition or at the start of storage, after storing the allulose composition at a temperature of 35°C for 4 weeks, the color value increase rate is 250% or less, 240% or less, 230% or less, 225% or less, 220% or less, 210% or less, 205% or less, 200% or less, 190% or less, 185% or less, 180% or less, 175% or less, 170% or less, 165% or less, 160% or less, 155% or less, 150% or less, 145% or less, 140% or less, 135% or less, 130% or less, 125% or less, 120% or less, 115% or less, or 110% or less.

[0022] An allulose composition according to an example of the present application may be in a liquid or syrup form. At this time, the solid content of the allulose liquid composition or allulose syrup may be, for example, 30 Brix or more, 40 Brix or more, 50 Brix or more, 60 Brix or more, more than 60 Brix, or 64 Brix or more. As an example, the solid content of the allulose liquid composition or allulose syrup is 30 to 99 Brix, 30 to 95 Brix, 30 to 90 Brix, 30 to 85 Brix, 30 to 80 Brix, 30 to 75 Brix, 30 Brix or more and less than 73 Brix, 30 to 70 Brix, 30 to 69 Brix, 30 to 68 Brix, 40 to 99 Brix, 40 to 95 Brix, 40 to 90 Brix, 40 to 85 Brix, 40 to 80 Brix, 40 Brix or more and less than 73 Brix, 40 to 75 Brix, 40 to 70 Brix, 40 to 69 Brix, 40 to 68 Brix, 50 to 99 Brix, 50 to 95 Brix, 50 to 90 Brix, 50 to 85 Brix, 50 to 80 Brix, 50 to 75 Brix, 50 Brix or more and less than 73 Brix, 50 to 70 Brix, 50 to 69 Brix, 50 to 68 Brix, 60 to 99 Brix, 60 to 95 Brix, 60 to 90 Brix, 60 to 85 Brix, 60 to 80 Brix, 60 to 75 Brix, 60 Brix or more and less than 73 Brix, 60 to 70 Brix, 60 to 69 Brix, 60 to 68 Brix, more than 60 and less than or equal to 99 Brix, more than 60 and less than or equal to 95 Brix, more than 60 and less than or equal to 90 Brix, more than 60 and less than or equal to 85 Brix, more than 60 and less than or equal to 80 Brix, more than 60 and less than or equal to 75 Brix, more than 60 and less than 73 Brix, more than 60 and less than or equal to 70 Brix, more than 60 and less than or equal to 69 Brix, more than 60 and less than or equal to 68 Brix, 64 to 99 Brix, 64 to 95 Brix, 64 to 90 Brix, 64 to 85 Brix, 64 to 80 Brix, 64 to 75 Brix, 64 Brix or more and less than 73 Brix, 64 to 70 Brix, 64 to 69 Brix, or 64 to 68 Brix.

[0023] The allulose liquid composition or the allulose syrup may contain allulose in an amount of 0.1% by weight or more, 3% by weight or more, 5% by weight or more, 10% by weight or more, 20% by weight or more, 30% by weight or more, 40% by weight or more, 50% by weight or more, 60% by weight or more, and, as an example, 0.1 to 100% by weight, based on 100% by weight of the solid content. For example, it may be a low-purity allulose syrup containing 1 to 50% by weight, 3 to 35% by weight, 3 to 25% by weight, 3 to 20% by weight, 5 to 35% by weight, 5 to 25% by weight, or 5 to 20% by weight, or a high-purity allulose solution containing 70% by weight or more, 75% by weight or more, 80% by weight or more, 85% by weight or more, 90% by weight or more, 95% by weight or more, 96% by weight or more, 97% by weight or more, or 98% by weight or more.

[0024] The viscosity of the allulose syrup can be 2 cps to 200 cps at a temperature of 45°C, and the electrical conductivity can be 1000 μS / cm or less, for example, 0.01 to 1000 μS / cm, 200 μS / cm or less, 150 μS / cm or less, 100 μS / cm or less, 80 μS / cm or less, 50 μS / cm or less, 30 μS / cm or less, for example, 0.1 to 200 μS / cm, 0.1 to 150 μS / cm, 0.1 to 100 μS / cm, 0.1 to 80 μS / cm, 0.1 to 50 μS / cm, or 0.1 to 30 μS / cm.

[0025] The allulose syrup according to an example of the present application may have a pH at the start of storage of 2.8 or more, or 5.5 or less. For example, it may be 2.8 to 5.5, 3.8 to 5.5, 3.9 to 5.5, 4.0 to 5.5, 4.1 to 5.5, 4.2 to 5.5, 4.3 to 5.5, 4.4 to 5.5, 4.5 to 5.5, 4.6 to 5.5, 4.7 to 5.5, or 4.8 to 5.5.

[0026] In a specific example, the allulose syrup can be obtained by a production method including an activated carbon treatment, SMB chromatography high-purity separation, and an ion purification step of a biologically obtained allulose-containing solution. Optionally, a step of concentrating the allulose syrup treated in the purification step can be further performed, or an ion purification step can be further performed after the activated carbon treatment step of the allulose-containing solution and before the high-purity separation. The ion purification step performed after the activated carbon treatment step may be the same as or different from the ion purification step performed after the high-purity separation step, and the ion exchange resin is not particularly limited.

[0027] The biologically obtained allulose-containing solution can be produced by culturing a microorganism that produces allulose epimerase or a recombinant microorganism into which a gene encoding allulose epimerase has been introduced, and reacting the microorganism that produces allulose epimerase or the allulose epimerase obtained therefrom with a fructose-containing raw material. The allulose epimerase can be carried out in a liquid reaction or a solid reaction using an immobilized enzyme. An example of the allulose conversion reaction is described in Korean Registered Patent No. 10-1318422 and the like.

[0028] The allulose-containing solution is subjected to SMB chromatography separation to be separated into an allulose fraction with a higher allulose content than the conversion reactant and a fructose raffinate. The allulose fraction is subjected to an ion purification step to be produced into an allulose syrup product, or an additional concentration step can be performed to be produced into a concentrated product. Separation / purification can include separating the allulose content in the allulose fraction to be 85% by weight or more, for example, 85% to 95% (w / w) or more.

[0029] Another example of the present application relates to an allulose storage package including an allulose composition according to an example of the present application and a storage container. The package may be sealed and the dissolved oxygen concentration of the allulose composition may not change or may be minimized.

[0030] The storage container for allulose applicable to this application includes a container body in which a storage space is formed inside, and an inlet connected to the storage space is formed at the upper part, and includes a lid member detachably coupled to the inlet of the container body and sealing the storage space. The shape or form of the container is not particularly limited.

[0031] The storage container may be made of a metal, a metal alloy, or a polymer material. When it is a metal or a metal alloy material, the inner surface of the container is preferably coated with a polymer to minimize direct contact with allulose syrup. The coating of the inner surface of the container preferably coats the entire inside of the container. The coating includes a single coating, a double coating, or a multiple coating of three or more times, and can be a multiple coating of two or more times to minimize direct contact between the allulose syrup and the metal or metal alloy material. The metal or metal alloy material is not particularly limited as long as it is a material that can be used for food containers. For example, the container may be made of tin or a tin alloy material. The coating agent for the inner surface of the container is not particularly limited as long as it is a substance that can be used for food containers. For example, it may be an epoxy phenolic resin that can be used for food containers. The inner surface of the container may include a coating layer of an epoxy phenolic resin, and specifically, it may be CanGard 5K-872 (trade name) of a commercially available product. Another example of this application relates to a method for increasing the stability of allulose, which includes a step of adjusting the dissolved oxygen in the allulose composition.

[0032] Another example of this application relates to a method for preventing browning of allulose, which includes a step of adjusting the dissolved oxygen (DO) in the allulose composition.

[0033] Another example of this application relates to a method for producing an allulose composition, which includes a step of converting fructose to allulose to obtain an allulose composition and a step of adjusting the dissolved oxygen in the allulose composition.

[0034] The step of adjusting the dissolved oxygen may be a step of reducing the dissolved oxygen. The step of reducing the dissolved oxygen may be to remove the dissolved oxygen in the allulose composition or to prevent an increase in the dissolved oxygen in the allulose composition.

[0035] The step of adjusting the dissolved oxygen may include one or more selected from the following 1 to 5: (1) A step of treating the allulose composition with a deoxidizer; (2) A step of packaging the allulose composition with a selectively permeable packaging material; (3) A step of performing an inert gas substitution; (4) A step of performing vacuum deaeration; and (5) A step of adjusting, for example, reducing the head space of the container containing the allulose composition.

[0036] The selectively permeable packaging material may be a packaging material that does not permeate oxygen.

[0037] The step of performing the inert gas substitution is to substitute the dissolved oxygen in the allulose composition with an inert gas, and the inert gas means a gas that does not cause a decrease in the allulose content or a gas that causes a lower degree of decrease in the allulose content compared to oxygen.

[0038] The step of adjusting the dissolved oxygen may be to adjust the dissolved oxygen concentration of the allulose composition to 8 ppm or less, or the oxygen saturation rate to 90% sat or less.

Advantages of the Invention

[0039] The allulose composition according to an example of the present application contains a dissolved oxygen concentration at a specific content, has a high allulose content storage rate, and is excellent in storage stability. Therefore, even if the allulose syrup is stored and distributed for a long period of time, the decomposition or conversion of allulose can be prevented, and a decrease in the allulose content can be minimized.

Brief Description of the Drawings

[0040]

Figure 1

Embodiment for Carrying Out the Invention

[0041] Hereinafter, this application will be described in more detail with the following examples. However, these examples are for illustrating this application, and the scope of this application is not limited by these examples.

Examples

[0042] Example 1: Stability of Allulose Syrup by Dissolved Oxygen Concentration (1) In order to clarify the influence of the dissolved oxygen concentration of allulose syrup on the stability of allulose content, allulose syrup samples with different dissolved oxygen concentrations were stored under harsh conditions for 7 days, and then the change in allulose content was measured.

[0043] Specifically, an allulose syrup (liquid sample) with an allulose purity of 98 wt / wt%, a pH of 4.1, and a solid content of 60 brix was placed in a 500 ml polyethylene sample container, and the allulose syrup was stirred to correct the dissolved oxygen concentration. The stirring speed was varied from 150 to 200 rpm, and the stirring time was varied from 0 seconds to 30 seconds, and the real-time dissolved oxygen concentration was measured with a DO meter (Hanna edge Do meter). For the saturated dissolved oxygen concentration in the range of 10 - 20%, it could be adjusted only by aeration without stirring. For values above that, it was adjusted by varying the stirring speed and stirring time, and as soon as the saturated dissolved oxygen concentration reached a constant value, it was immediately sealed to maintain the dissolved oxygen concentration. The dissolved oxygen concentrations of the 4 types of allulose syrup produced are listed in Table 1.

[0044] Each allulose syrup sample was stored at a temperature of 45°C, and an accelerated test was conducted. After 7 days of storage, a small amount of each sample was collected, water was added, and it was diluted to 3 brix to prepare an analysis sample. The allulose content of the analysis sample was measured by HPLC analysis. The specific HPLC analysis conditions were as follows: using an 87C (Biorad HPX-87C, 7.8 mm Φ × 300 mm) column, at a temperature of 80°C, flowing 100% water as the mobile phase at a flow rate of 0.6 ml / min, and detecting using an RI Detector. In Table 1, the allulose content is the allulose content based on 100% by weight of the solid content of the allulose syrup.

[0045]

Table 1

[0046] Example 2: Stability of allulose syrup depending on dissolved oxygen concentration (2) An allulose syrup with an allulose purity of 98 wt / wt%, a pH of 4.1, and a solid content of 64 brix was used, and the change amount and change rate of the allulose content depending on the dissolved oxygen concentration were shown in Table 2 in substantially the same manner as in Example 1.

[0047]

Table 2

[0048] Example 3: Stability of allulose syrup depending on dissolved oxygen concentration (3) An allulose syrup with an allulose purity of 98 wt / wt%, a pH of 4.1, and a solid content of 68 brix was used, and the change amount and change rate of the allulose content depending on the dissolved oxygen concentration were shown in Table 3 in substantially the same manner as in Example 1.

[0049]

Table 3

[0050] Example 4: Stability of allulose syrup depending on dissolved oxygen concentration (4) Using an allulose syrup with an allulose purity of 98 wt / wt%, a pH of 4.1, and a solid content of 73 Brix, the change amount and change rate of the allulose content due to the dissolved oxygen concentration were measured in the same manner as in Example 1 and shown in Table 4.

[0051]

Table 4

[0052] As shown in Tables 1 to 4, the allulose loss rate was low due to the decrease in the dissolved oxygen concentration of the allulose syrup. Specifically, when stored at a temperature of 45°C for 7 days, the reduction rate of the allulose content in the allulose syrup with a dissolved oxygen concentration of 8 ppm or less, or an oxygen saturation rate of 90% sat or less, was 5% or less, and the storage stability of the allulose syrup was significantly excellent.

[0053] Example 5: Stability of Allulose Syrup Depending on Dissolved Oxygen Concentration during Long-Term Storage (1) In order to clarify the effect of the dissolved oxygen concentration on the stability of the allulose content when the allulose syrup was stored for a long time, after storing allulose syrup samples with different dissolved oxygen concentrations for 4 weeks, the change in the allulose content was measured.

[0054] Specifically, an allulose syrup with an allulose purity of 97% or more, a pH of 4.15, and a solid content of 60 Brix was prepared. After adjusting the dissolved oxygen concentration in the same manner as in Example 1, each sample was stored at a temperature of 35°C for 4 weeks, and then the allulose content was measured. The change rate of the allulose content was calculated and shown in Table 5 and Figure 1. In Table 5, the allulose content is the allulose content shown based on 100% by weight of the solid content of the allulose syrup.

[0055]

Table 5

[0056] Example 6: Stability of allulose syrup depending on dissolved oxygen concentration during long-term storage (2) An allulose syrup with an allulose purity of 97% or more, a pH of 4.15, and a solid content of 64 Brix was used, and the change amount and change rate of the allulose content depending on the dissolved oxygen concentration were shown in Table 6 and Figure 1 in substantially the same manner as in Example 5. In Table 6, the allulose content is the allulose content shown based on 100% by weight of the solid content of the allulose syrup.

[0057] [Table 6]

[0058] Example 7: Stability of allulose syrup depending on dissolved oxygen concentration during long-term storage (3) An allulose syrup with an allulose purity of 97% or more, a pH of 4.15, and a solid content of 68 Brix was used, and the change amount and change rate of the allulose content depending on the dissolved oxygen concentration were shown in Table 7 and Figure 1 in substantially the same manner as in Example 5. In Table 7, the allulose content is the allulose content shown based on 100% by weight of the solid content of the allulose syrup.

[0059] [Table 7]

[0060] Example 8: Stability of allulose syrup depending on dissolved oxygen concentration during long-term storage (4) An allulose syrup with an allulose purity of 97% or more, a pH of 4.15, and a solid content of 73 Brix was used, and the change amount and change rate of the allulose content depending on the dissolved oxygen concentration were shown in Table 8 and Figure 1 in substantially the same manner as in Example 5. In Table 8, the allulose content is the allulose content shown based on 100% by weight of the solid content of the allulose syrup.

[0061] [Table 8]

[0062] As shown in Tables 5 to 8, the lower the dissolved oxygen concentration of allulose syrup, the lower the allulose loss rate. Specifically, when stored at 35°C for 4 weeks, when the dissolved oxygen concentration is 8 ppm or less, or the oxygen saturation rate is 90% sat or less, the reduction rate of the allulose content in allulose syrup is 10% or less, and the storage stability of allulose syrup is significantly excellent. In particular, as shown in Figure 1, the change in allulose content due to the dissolved oxygen concentration was large in allulose syrup with 64 Brix or more.

[0063] Therefore, it is possible to prevent the quality deterioration in which the allulose content during the distribution period decreases by adjusting the allulose syrup's resistance to dissolved oxygen concentration, and it is possible to provide an allulose syrup with excellent allulose content maintaining effect and high stability.

[0064] Example 9: pH Stability of Allulose Syrup Depending on Dissolved Oxygen Concentration For the allulose syrups of Examples 5 to 8, the pH was measured immediately after sample production, and after storing at 35°C for 4 weeks, the pH was measured, and the amount of pH change was calculated and shown in Table 9.

[0065]

Table 9

[0066] As shown in Table 9, the lower the dissolved oxygen concentration of allulose syrup, the lower the amount of pH decrease. Specifically, when stored at 35°C for 4 weeks, the amount of pH decrease in allulose syrup with a dissolved oxygen concentration of 8 ppm or less, or an oxygen saturation rate of 90% sat or less, was 1 or less, and the pH stability of allulose syrup was significantly excellent.

[0067] Example 10: Color Stability of Allulose Syrup Depending on Dissolved Oxygen Concentration The color value of the allulose syrup of Examples 5 to 8 was measured immediately after sample production, and after storage at a temperature of 35°C for 4 weeks, the color value was measured, and the color change rate was calculated and shown in Table 10. The color value was measured at 420 nm using a 1 cm quartz cell after diluting the allulose syrup to 30 bx using a spectrophotometer (SHIMADZU).

[0068]

Table 10

[0069] As shown in Table 10, the lower the dissolved oxygen concentration, the lower the color value change rate of the allulose syrup, which means that it is possible to prevent browning of the allulose syrup by adjusting the dissolved oxygen concentration of the allulose syrup.

Claims

1. A liquid allulose composition containing allulose, having a dissolved oxygen (DO) concentration of 8 ppm or less, or an oxygen saturation rate of 90% sat or less.

2. The composition according to claim 1, wherein the solid content of the composition is 30 to 99 Brix.

3. The composition according to claim 1, wherein the allulose content of the composition is 5% by weight or more based on 100% by weight of the total solid content of the composition.

4. The composition according to claim 1, wherein the pH of the composition is 2.8 to 5.

5.

5. The composition according to claim 1, wherein the reduction rate of the allulose content after storage at a temperature of 45°C for 7 days is 10% or less based on the allulose content at the start of storage.

6. The composition according to claim 1, wherein the reduction rate of the allulose content after storage at a temperature of 35°C for 4 weeks is 10% or less based on the allulose content at the start of storage.

7. The composition according to claim 1, wherein the decrease value of the pH after storage at a temperature of 35°C for 4 weeks is 1 or less based on the pH at the start of storage.

8. The composition according to claim 1, wherein the increase rate of the color value after storage at a temperature of 35°C for 4 weeks is 250% or less based on the color value at the start of storage.

9. An allulose storage package including the composition according to any one of claims 1 to 8 and a storage container.

10. The package according to claim 9, wherein the package is sealed.

11. A method for increasing the stability of allulose, including a step of reducing the dissolved oxygen (DO) in the allulose composition.

12. The method according to claim 11, wherein the step of reducing the dissolved oxygen includes one or more selected from the following 1 to 5: (1) A step of treating with a deoxidizer; (2) A step of packaging with a selectively permeable packaging material; (3) A step of performing inert gas replacement; (4) A step of vacuum deaeration; and (5) A step of adjusting the headspace of the container containing the allulose composition.

13. The method according to claim 11, wherein the step of reducing the dissolved oxygen adjusts the dissolved oxygen concentration of the allulose composition to 8 ppm or less, or the oxygen saturation rate to 90% sat or less.

14. A method for preventing browning of allulose, comprising the step of reducing the dissolved oxygen (DO) in the allulose composition.

15. A step of converting allulose from fructose to obtain an allulose composition; and A method for producing an allulose composition, comprising the step of reducing the dissolved oxygen (DO) in the allulose composition.

16. The method according to claim 15, wherein the step of reducing the dissolved oxygen comprises one or more selected from the following 1 to 5: (1) A step of treating with a deoxidizer; (2) A step of packaging with a selectively permeable packaging material; (3) A step of performing an inert gas substitution; (4) A step of vacuum deaeration; and (5) A step of adjusting the headspace of the container containing the allulose composition.

17. The method according to claim 15, wherein the step of reducing the dissolved oxygen adjusts the dissolved oxygen concentration of the allulose composition to 8 ppm or less, or the oxygen saturation rate to 90% sat or less.

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